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Mites and Allergens at Home in U.S.

Ever wonder about those dust bunnies skirting the corners of your home? They may be causing more than housework havoc, according to research presented at the 96th International Conference of the American Thoracic Society on May 9.

Previous research suggested that allergens in homes and buildings increase the risk of allergies and asthma. So researchers from the National Institute of Environmental Health Sciences (NIEHS), a part of the National Institute of Health, developed the National Allergen Survey to determine the levels and effects of allergens (including dust mites and cockroach allergens) in the floors and beds of American homes.

"We found that cumulative exposure to indoor allergens can increase the risk and severity of allergies and asthma," said lead researcher, Dr. Patrick Vojta, PhD, of NIEHS.

His team selected 831 homes from 75 U.S. regions of diverse ethnic and socioeconomic groups. They collected and studied vacuumed dust from up to seven sites per home. They also looked for dust mite and cockroach allergens in the bed dust of 551 homes. Questionnaires were given to the homeowners about the presence of pets, smokers, rodents and previous cockroach infestations.

Their results showed that bedding in over 44 million homes in the U.S., or almost half of homes in America, contains dust mite allergen concentrations exceeding two micrograms per gram of dust -- levels high enough to cause allergies. Of these, about 22 million homes have bedding dust concentrations high enough to trigger asthma symptoms in asthmatics.

"This is a surprisingly large number of homes that have levels of allergens that could easily be reduced with preventative measures," said Dr. Vojta. He suggests impermeable mattress covers, frequent hot-water washing of bedding and cockroach extermination.

The National Allergen Survey found that only four percent of the homes studied had allergen-proof bedding and less than 40 percent of the homeowners frequently washed bedding in hot water. "For people with allergies and asthma, methods to reduce exposure help decrease the frequency and severity of their condition."

Dust mites and cockroaches shed proteins in their oral or fecal matter that act as allergens, irritating or inflaming respiratory passages. Cockroach allergens are present in about four million homes with 1.2 million homes having beds with dust at allergy-causing levels.

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